JP2001326131A - Capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a capacitor which is constituted to form better heat radiating states of capacitor elements, has a solid structure, and can be manufactured inexpensively and easily. SOLUTION: This capacitor is provided with an encapsulating case 2, housing the capacitor elements 1a-1c and lead-out terminal sections 6 electrically connected to the elements 1a-1c. The capacitor is also provided with slit sections 3 which are made through one of the facing wall surfaces of the case 2, so as to separate the elements 1a-1c from each other, connecting sections 2b which connect the elements 1a-1c to each other in the case 2, and an insulating resin 5 packed in the case 2 through the connecting sections 2b and potted in the case 2, in a state where a sealing property is maintained. Consequently, air layers which are continuous to the outside can be provided among the capacitor elements 1a-1c, and the heat generated from the elements 1a-1c can be radiated directly to the outside through the slit sections 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capacitor having a heat dissipation structure, such as a power capacitor used for improving a power factor and an electric device capacitor used for various electric circuits.

[0002]

2. Description of the Related Art In recent years, dry capacitors in which an insulating resin is disposed around a capacitor element have become mainstream.

[0003] Conventionally, a proposal for a heat radiating structure for a dry capacitor of this type is disclosed in Japanese Patent Application Laid-Open No. 01-9691.
7, Japanese Patent Application Laid-Open No. 62-76513, Utility Model Release, Actual Kaihei 0
5-79906, the structure as shown in the gazette was common. Hereinafter, the configuration will be described with reference to FIGS. In JP-A-01-96917,
As shown in FIG. 25, a semicircular vertical groove 21 is formed around a rod 19 disposed at the center of the group of capacitor elements 18,
A through hole 20 is formed in the center, and the vertical groove 2 is used.
One having six capacitor elements 18 arranged in parallel is provided in two stages. The elements 18 are connected in parallel for each stage, and these are connected in series. Twelve of the elements 18 in each stage are collectively cast around them with a synthetic resin 22, for example, an epoxy resin. The heat due to the capacitor loss generated when the capacitor element 18 is energized is transmitted through the lead wire from the element 18 and radiated to the outside, and the heat radiated to the outside through the casting synthetic resin 22 outside the element 18. In addition to radiating heat from the path, the heat of self-heating from each element 18 is directly conducted to the rod 19, and a radiating path for radiating heat from the rod 19 to the outside is added, thereby improving the heat radiation effect.

In Japanese Patent Application Laid-Open No. 62-76513, FIG.
As shown in (1), a plurality of cylindrical or flat capacitor elements 23 are connected in parallel and arranged in parallel, and a synthetic resin 25 such as an epoxy resin is molded around the capacitor elements 23 to form an insulating layer. The dielectric layer of the capacitor element 26 is impregnated with the synthetic resin 25 in advance or at the time of molding. A plurality of air ducts 24 are provided on the insulator in the axial direction of the capacitor element 26, and the air ducts 24 are formed simultaneously when the insulating layer is molded. Thus, the condenser element 23 is cooled by passing the high-pressure condenser through the air duct 24 in accordance with the natural flow or by forcibly blowing air.

[0005] In the case of Japanese Utility Model Laid-Open No. 05-79906, FIG.
As shown in FIG. 5, a composite electronic component in which a heat-generating component resistor 27 and a capacitor 26 and a diode 28, which are weakly heat-generating components, are housed and integrated in the same exterior case 29, A first through slit 31 is formed, and a second through slit corresponding to the first through slit 31 is formed on the lower surface of the outer case, and a first barrier and a resistor are provided between the resistor 27 and the diode 28. A second barrier is disposed opposite to the first barrier at a predetermined interval, and a ventilation portion communicating the first through slit and the second through slit is formed between the first barrier and the second barrier. The purpose is to effectively protect the capacitor 26 and the diode 28, which are low heat components, from heat generating components such as the resistor 27. In FIG. 27, reference numeral 30 denotes an extraction terminal, and 32 denotes a barrier portion.

[0006]

However, these proposals have the following problems.

[0007] Japanese Patent Application Laid-Open No. 01-9691 shown in FIG.
In (7), since a semicircular vertical groove 21 is formed around the rod-shaped body 19 arranged at the center of the group of capacitor elements 18 and a through-hole 20 is formed at the center, it is used. It was necessary to match the shape of the rods 19 to the shape of each element 18 and to prepare rods 19 of various shapes for each rated product. Then, six capacitor elements 18 arranged side by side in the vertical groove 21 are provided in two stages. The elements 18 are connected in parallel for each stage, and these are connected in series. Twelve of the elements in each stage are collectively surrounded by synthetic resin 2 around them.
2. Since it is cast with, for example, epoxy resin, when the capacitor element 18 is assembled, the shape is cylindrical and it is difficult to form a rectangular parallelepiped which is a general shape of a capacitor. Casting and forming the epoxy resin 22 on the shaped body also required various steps. Further, the heat of self-heating from each capacitor element 18 is directly
9, a heat radiation path is formed to conduct heat and radiate heat from the rod-shaped body 19 to the outside. However, the heat radiation amount of the rod-shaped body 19 is not sufficient compared with the number of the capacitor elements 18 and heat generation.
Although the heat generation on the capacitor element surface adjacent to the rod element 19 is somewhat reduced, the heat generation on the capacitor element surface not adjacent to the rod 19 is not reduced, and a heat gradient is generated inside the capacitor element 18. The heat balance was impaired, and the characteristics of the capacitor element 18 were adversely affected.

FIG. 26 shows an example of Japanese Patent Application Laid-Open No. 62-7651.
In (3), a plurality of cylindrical or flat capacitor elements 23 are connected in parallel and arranged in parallel, and a synthetic resin 25 such as an epoxy resin is molded around the capacitor elements 23 to form an insulating layer. . The synthetic resin 25 is impregnated in the dielectric layer of the capacitor element 23 in advance or at the time of molding. A plurality of air ducts 24 are provided on the insulator in the axial direction of the capacitor element 23. Since the air duct 24 is formed simultaneously when the insulating layer is molded, the arrangement and connection of the capacitor element 23 and the formation of the air duct 24 are made of synthetic resin. 25 must be performed when the capacitor element 23 is molded. Forming an air duct 24 of an appropriate size around the capacitor element 23 using a synthetic resin having high fluidity is equivalent to mold molding, and is extremely complicated. If a process is required, and if the formation is not performed properly, it is difficult to maintain the quality of the capacitor, such as when the capacitor element 23 projects from the air duct 24 to the surface. As described above, if the formation of the air duct 24 is not successful, the cooling effect of the capacitor element 23 is significantly reduced,
As a result, the characteristics of the entire capacitor may be seriously affected. Further, even if the air duct 24 is arranged as shown in FIG. 26, the capacitor element 23 located at the center of the array of the capacitor elements 23 is supplied with radiant heat from front, rear, left and right, and has the highest temperature in the capacitor assembly. Points are formed and dielectric breakdown easily occurs.

[0009] FIG.
6, a first through slit 31 is formed on the upper surface of the outer case 29, and a second through slit corresponding to the first through slit 31 is formed on the lower surface of the outer case 29. A first barrier and a second barrier are opposed to each other at a predetermined interval between the first barrier and the diode 28;
Since a ventilation portion is formed between the first barrier and the second barrier, which communicates the first through slit and the second through slit, the first through slit 31 and the second through slit are formed. It has to be formed corresponding to a predetermined position, and there is a dimensional restriction on the formation. Further, as shown in FIG. 27, the connecting portion between the portion for housing the resistor and the portion for housing the other components needs to be connected from both sides of the case, resulting in a structure that is deteriorated in strength and extremely small in size. When arranging components in a space, it is difficult to reduce workability and ensure quality.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide a structure for forming a better heat radiation state of a capacitor element, which is structurally strong, inexpensive, excellent in workability, and easy to install. The purpose is to provide an easy-to-use capacitor.

[0011]

According to a first aspect of the present invention, there is provided a capacitor comprising: an outer case accommodating a plurality of capacitor elements; and an external lead-out terminal electrically connected to the capacitor elements. And an opening on one of the opposite wall surfaces of the outer wall case, a slit portion is provided on the outer case so as to separate each capacitor element, and a connecting portion for communicating between the capacitor elements is provided on the outer case. An insulating resin which is provided in the case and is potted in a state where the hermeticity is maintained in the outer case is filled through the connecting portion.

As described above, since the slit is provided in the outer case so as to open on one of the opposing wall surfaces of the outer wall case and to separate the respective capacitor elements, the plurality of capacitor elements can be separated. It is possible to provide an air layer that is continuous with the outside, and it is possible to radiate heat generated by the capacitor element to the outside through the slit portion directly. Further, since the opening is provided on one wall surface of the outer case, the case is continuously formed on the other wall surface. Therefore, the mechanical strength of the capacitor outer case does not decrease.

[0013] Further, a communication portion for communicating between the capacitor elements is provided in the outer case, and the insulating resin potted while the hermeticity is maintained in the outer case is filled through the communication portion. Electrical connection between the respective capacitor elements can be easily made, and the potted insulating resin is continuously filled in the outer case, so that only one potting operation is required and the forming operation is efficient. At the same time, the temperature distribution at the time of curing the potting resin is improved by the above configuration, and the curing is completed in a short time.

According to a second aspect of the present invention, in the first aspect, the outer case has a plurality of element spaces arranged in parallel in a longitudinal direction, and the slit portion has a plurality of capacitor elements housed in the element spaces. Was configured to be electrically insulated.

As described above, the outer case has a plurality of element spaces in parallel in the longitudinal direction, and the slit portion electrically insulates the plurality of capacitor elements housed in the element spaces. Therefore, when capacitor elements having different electrodes are simultaneously housed in the same capacitor outer case, there is no need to perform insulation between individual elements, and capacitor elements can be stored continuously in the longitudinal direction. The effect of the first aspect can be exhibited at the same time as making the capacitor compact.

According to a third aspect of the present invention, in the capacitor according to the second aspect, a plurality of slit portions are formed on a longitudinal wall surface of the outer case, and the opening directions of the slit portions are different from each other. Open to one or the other.

As described above, the plurality of slits are formed on the wall surface in the longitudinal direction of the outer case, and the opening directions of the slits are different, and the slits are opened on one or the other of the opposed wall surfaces in the longitudinal direction. Therefore, an air layer continuous with the outside can be provided between the plurality of capacitor elements, and heat generated by the capacitor elements can be radiated to the outside directly through the slit portion. In addition, since the slit portions are randomly arranged on the longitudinal wall surface, the heat radiation effect is substantially uniformly distributed on the longitudinally opposed wall surface without being concentrated on one case wall surface. It becomes possible. In particular, the effect is enormous when three or more elements are used.

According to a fourth aspect of the present invention, in the condenser according to the second or third aspect, the slit portion has a height equal to 1 / H of the height of the outer case.
It has an opening height of 2 or more and is opened based on the bottom surface of the outer case.

As described above, since the slit has an opening height equal to or more than の of the height of the outer case and is opened based on the bottom surface of the outer case, the height of the slit is:
Since the height of the capacitor element is always lower than that of the outer case, the capacitor element is open to at least half the height of the capacitor element. That is, at the hottest point where the temperature of the capacitor element becomes the highest, the heat radiation effect is reduced. There is an operational effect that can be obtained.

According to a fifth aspect of the present invention, there is provided a capacitor according to the second aspect.
In 3 or 4, the width of the slit portion in the width direction is 0.4 mm to 10 mm.

Since the width of the slit in the width direction is 0.4 mm to 10 mm, it is difficult to form the slit when the width of the slit in the width direction is 0.4 mm or less. Or a sufficient air convection cannot be obtained, a predetermined heat radiation effect cannot be obtained, and a heat radiation effect of 10 mm or more can be sufficiently obtained. Can be obtained unnecessarily large, and a function and effect can be obtained without lowering the mechanical strength due to the connecting portion of the capacitor outer case.

The capacitor according to the sixth aspect is the second aspect.
In 3, 4, or 5, a terminal block for fixing the external lead-out terminal section was provided, and this terminal block was fixed above the slit section protruding into the exterior case.

As described above, the terminal block for fixing the external lead-out terminal portion is provided, and this terminal block is fixed on the upper portion of the slit protruding into the outer case, so that a new terminal for fixing the external lead-out terminal portion is provided. There is no need to install parts,
It is possible to appropriately and reliably install the capacitor on the upper part of the capacitor outer case. Therefore, there is an effect that the workability for installing the external lead-out terminal portion and the assurance of appearance quality are remarkably improved.

According to a seventh aspect of the present invention, there is provided a capacitor assembly including a plurality of outer cases for connecting the capacitors according to the first, second, third, fourth, fifth or sixth aspect in parallel. A projection was provided on the wall surface opposite to the provided wall surface, and this projection was fitted to a slit portion of another exterior case to connect and fix the exterior cases.

As described above, a plurality of outer cases are provided for connecting capacitors in parallel, and a projection is provided on a wall surface opposite to a wall surface provided with a slit portion of the outer case. The outer case is connected and fixed by fitting with the slit part of this type, so this type of capacitor forms a new part for connecting width direction capacitors in the case of parallel connection generally performed. Since the connecting operation can be performed without any problem, the working effect is improved.

In the capacitor assembly according to an eighth aspect of the present invention, in the seventh aspect, the projection is provided with a stopper portion which is fitted and positioned in the slit portion so as to make the installation interval between the outer cases constant. .

As described above, since the stopper portion which is fitted and positioned in the slit portion is provided on the protruding portion so as to keep the installation interval between the outer cases constant, the capacitors can be installed and connected in parallel. It is possible to maintain an appropriate distance only by installing in parallel a space distance determining operation for preventing deterioration of characteristics due to heat generation between capacitors, which is a problem of the above. For this reason, it has the effect of eliminating human error such as incorrect installation distance.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of a capacitor according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional plan view of the capacitor according to the first embodiment.

As shown in FIG. 1, this capacitor includes an outer case 2 for accommodating a plurality of capacitor elements 1a to 1c, and an external lead-out terminal 6 electrically connected to the capacitor elements 1a to 1c. In addition, a slit portion 3 is provided in the outer case 2 so as to open on one of the opposing wall surfaces of the outer wall case 2 and separate the respective capacitor elements 1a to 1c. The outer case 2 has a plurality of element spaces 2a arranged in parallel in the longitudinal direction, and the slits 3 electrically insulate the plurality of capacitor elements 1a to 1c housed in the element spaces 2a. In addition, a communication portion 2a for communicating between the capacitor elements 1a to 1c is provided in the outer case 2, and an insulating resin 5 potted while the hermeticity is maintained in the outer case 2 is filled through the communication portion 2a. .

As shown in FIG. 2, the slit portion 3 is formed between each capacitor element when a plurality of capacitor elements 1a to 1c are arranged in the longitudinal direction on the outer case 2. In this case, the wall surfaces 4a, 4b And the wall surface 4c. Also, the slits 3 are formed so as to connect the respective walls to the upper portions of the wall surfaces 4a, 4b, and 4c so that the insulating resin can be potted later inside the outer case 2. Further, the space of the slit portion 3 is continuously connected to the space below in FIG. 2, so that convection of air is naturally possible.

FIG. 3 is a front view of the capacitor according to the first embodiment, and FIG. 4 is a side view of the first embodiment. As shown in FIG. 3, the space of the slit portion 3 includes a wall surface 4 a and a wall surface 4 a.
b, the wall surface 4c and the upper wall surface 4d. Further, no wall surface is formed below the slit portion 3. That is, the space of the slit portion 3 is continuously connected to the space below in FIG. 3, and convection of air is naturally possible as in FIG.

As shown in FIG. 4, the space of the slit portion 3 is continuously connected to the space below FIG. 4 and the space on the left side of FIG. 4, and the air can move as indicated by the arrow in FIG. It becomes possible. In this case, if the projections 2c and the like are provided on the outer case 2 so that the lower part of the capacitor does not adhere to the mounting surface when the capacitor is mounted upright as shown in FIG. These shapes may be shared with the mounting legs, or may be projections as shown in the figure.

As described above, according to this embodiment, when the outer case opening of the outer case 2 for housing the capacitor elements 1a to 1c is on the upper side, the outer case 2 is provided on one of the side walls of the outer case 2. Since the slit portion 3 is provided so as to separate the capacitor elements 1a to 1c, an air layer continuous with the outside can be provided between the plurality of capacitor elements 1a to 1c. The heat of 1c can be radiated to the outside through the slit portion 3 directly. Also, since the capacitor case 2 is open to one side portion in one direction, the other side portion is continuously formed with a case. Therefore, the mechanical strength of the capacitor case 2 does not decrease. Further, since the connecting portion 2b for communicating between the capacitor elements 1a to 1c and the capacitor capable of maintaining the hermeticity so that the insulating resin 5 can be potted in the outer case 2, the connecting portion allows the electrical connection between the respective capacitor elements 1a to 1c. In addition, the electrical connection can be easily made, and the potted insulating resin 5 is continuously filled in the outer case 2, so that the potting operation is completed once and the forming operation is efficient. At the same time, the temperature distribution at the time of curing the potting resin 5 is also improved by the above configuration,
There is also an effect that curing is completed in a short time.

FIGS. 5 and 6 show a conventional capacitor for comparison with the first embodiment. FIG. 5 is a sectional plan view of a conventional capacitor for comparison with the present invention, and FIG. 6 is a front view thereof.

That is, the conventional capacitor shown in FIGS. 5 and 6 includes an outer case 42 having a continuous inner space for accommodating the capacitor elements 1a to 1c, and an outer lead-out terminal portion 6. Capacitor elements 1a-1
c is arranged in the longitudinal direction, the insulating film 7 is used to maintain electrical insulation between the adjacent capacitor elements 1a to 1c.
Are inserted between the capacitor elements 1a to 1c.
At this time, it is necessary to use an insulating film 7 and the like for maintaining electrical insulation which are formed larger than the element dimensions of the capacitor elements 1a to 1c. However, in the conventional capacitor, it is necessary to insert the insulating film 7 between the capacitor elements 1a to 1c in which different electrode elements are connected by lead wires or the like, and the positions of the respective capacitor elements 1a to 1c are also
Since the insulating film 7 is not properly defined in the outer case 42 having the continuous interior space, the insulating film 7 may move freely, and the insulating film 7 floats when the potting insulating resin 5 is filled. In some cases. For this reason, there is a case where the insulation between the capacitor elements 1a to 1c cannot be sufficiently maintained, and there is a problem in quality and work man-hour.

On the other hand, as in the first embodiment, the outer case 2 has a plurality of element spaces 2a in the longitudinal direction, and the slit portion 3 of the outer case 2 has When the capacitor elements 1a to 1c are electrically insulated from each other, when the capacitor elements 1a to 1c having different electrodes are simultaneously housed in the same capacitor outer case 2, the unique insulation between the respective elements can be achieved. It is not necessary to continuously perform the capacitor elements 1a to 1a in the longitudinal direction.
c can be stored, and an effect of making the different electrode capacitor compact can be exhibited.

A second embodiment of the present invention will be described with reference to FIGS. FIG. 7 is a sectional plan view of a capacitor according to a second embodiment of the present invention, and FIG. 8 is a front view of the capacitor according to the second embodiment.

As shown in FIGS. 7 and 8, the capacitor includes an outer case 2 for housing the capacitor elements 1a to 1c, and an external lead-out terminal 6, and the outer case 2 includes a plurality of capacitor elements 1a to 1c. When 1c is arranged in the longitudinal direction, a slit portion 3 is formed between each capacitor element. The plurality of slits 3 are formed on the wall surface in the longitudinal direction of the outer case 2, and the opening directions of the slits 3 are different, and are opened on one or the other of the opposed wall surfaces in the longitudinal direction. In this case, the plurality of slits 3 formed in the outer case 2 are formed on the wall surface in the longitudinal direction with respect to the opening of the outer case 2, and the plurality of slit openings 3 are formed on the wall in the longitudinal direction opposite to the opening direction. On the other hand, it is formed so as to be randomly arranged.

That is, in FIGS. 7 and 8, since three capacitor elements 1a to 1c are used, there are two slit portions 3 formed therebetween. The two slit portions 3 are formed on opposing longitudinal wall surfaces. That is, the opening directions of the respective slit portions 3 with respect to the outer wall are different from each other.

As described above, according to this embodiment, the plurality of slits 3 formed in the outer case 2 are formed on the wall surface in the longitudinal direction with respect to the opening of the outer case 2, and the plurality of slits 3 are formed. Are formed such that the slit opening directions of the capacitor elements 1a to 1c are arranged at random with respect to the longitudinal wall surfaces facing each other.
It is possible to provide an air layer that is continuous with the outside between them, and it is possible to radiate the heat generated by the capacitor elements 1 a to 1 c directly to the outside through the slit portion 3. In addition, since the slit portions 3 are randomly arranged on the wall surface in the longitudinal direction, the heat radiation effect is not substantially concentrated on one of the wall surfaces of the case, but is substantially uniformly distributed on the wall surface facing in the longitudinal direction. The effect is particularly great when three or more elements are used.

A third embodiment of the present invention will be described with reference to FIGS. FIG. 9 is a front view of a capacitor according to a third embodiment of the present invention.

As shown in FIG. 9, in the first and second embodiments, the slit portion 3 has an opening height that is at least half the height of the outer case 2 and is based on the bottom surface of the outer case 2. It is open to. In this case, the height b of the right slit portion 3 formed in the outer case 2 is equal to or more than あ る of the height a of the outer case 2 and the opening height is equal to or greater than the height a of the outer case 2.
The opening is based on the bottom direction. The height b 'of the left slit portion 3' is made to be an opening height which is 2/5 of the height a of the outer case 2.

Next, in order to verify the effect, a test was conducted in which a plurality of heights b of the right slit portion 3 were formed to have arbitrary dimensions, and the temperature rise of the capacitor was measured at the X portion in the center of FIG. went. The energizing condition was 1.2 times the rating, and the ambient temperature was room temperature (20 ° C.).

FIG. 10 shows the test results described above.
It is a graph of the temperature rise ratio of the capacitor according to formation height of the slit part in 3rd Embodiment. In FIG.
The horizontal axis indicates the ratio between the arbitrary slit height b and the case height a. The vertical axis represents the ratio with the temperature rise value when no slit is formed being 100%.

As is clear from FIG. 10, the slit height b
It can be seen that the higher the is, the lower the temperature rise value is. Further, in order to obtain an effect of 50% at which the effect of reducing the temperature rise value is effective, the height b of the slit portion 3 is set to the outer case 2.
Is obtained when the height a is reduced to 50%, that is, １ ／. When the height is further increased, the effect increases.

As described above, according to this embodiment, the slit 3 formed in the outer case 2 is
The height of the slit portion 3 is higher than that of the outer case 2 because the opening height is not less than の of the height of the outer case 2 and the opening is based on the bottom direction of the outer case 2. Therefore, the heat radiation effect is obtained at the hottest point where the temperature of the capacitor elements 1a to 1c becomes the highest. Has the effect.

Although the left and right heights are described differently in FIG. 9, the outer case 2 is naturally left and right at the same height.
Needless to say, the same effect can be obtained if the height a is 1/2 or more.

A fourth embodiment of the present invention will be described with reference to FIGS. FIG. 11 shows a fourth embodiment of the present invention.
It is a capacitor front view of an embodiment.

As shown in FIG. 11, in the first and second embodiments, the opening c in the width direction of the slit 3 is 0.4
mm to 10 mm. In this case, the width c of the right slit 3 formed in the outer case 2 is set to 0.4 mm to 10 m.
m. Further, with respect to the above range of the width c of the slit portion 3, a suitable range of the height and the depth of the slit portion 3 is as follows.
The height is の of the outer case height, and the depth is ／ of the case depth.

Next, in order to verify the effect, a test was performed in which a plurality of widths c of the right slit portion 3 were formed to have an arbitrary size, and the temperature rise of the capacitor was measured at the X portion in the center of FIG. Was. The opening dimension c 'of the left slit 3' is 1 mm
Set in. The energizing condition was 1.2 times the rating, and the ambient temperature was room temperature (20 ° C.).

FIG. 12 shows the test results described above.
It is a graph of the temperature rise ratio of the capacitor according to the width | variety of a slit part in 4th Embodiment. In FIG. 12, the horizontal axis indicates the dimension of an arbitrary slit width c. The vertical axis represents the ratio with the temperature rise value when no slit is formed being 100%.

As is apparent from FIG. 12, the temperature rise value decreases as the slit width c increases. Further, in order to obtain a 50% effect that the effect of reducing the temperature rise value is effective, the width c of the slit portion 3 is obtained by setting the width c to 0.4 mm, and the effect increases as the width is further increased. .

As described above, according to this embodiment, the opening c in the width direction of the slit 3 formed in the outer case 2 is 0.4 mm to 10 mm.
When the opening dimension in the width direction of the slit portion 3 is 0.4 mm or less, a method of forming the slit portion 3 is difficult, or sufficient convection of air cannot be obtained, and a predetermined heat radiation effect can be obtained. If it is 10 mm or more, a sufficient heat radiation effect can be obtained, but the external dimensions are unnecessarily large, and the mechanical strength does not decrease due to the connecting portion of the capacitor outer case 2. The effect can be obtained. In addition, you may comprise with Embodiment 3.

A fifth embodiment of the present invention will be described with reference to FIGS. FIG. 13 shows a fifth embodiment of the present invention.
FIG. 14 is a cross-sectional front view of the capacitor according to the embodiment of FIG.
3 is an enlarged view of an α portion of FIG.

As shown in FIG. 13, this capacitor is
As in the first and second embodiments, a plurality of capacitor elements 1 a to 1 c housed in the outer case 2 and an external lead terminal 6 are provided. In addition, a terminal block 8 for fixing the external lead-out terminal section 6 is provided, and the terminal block 8 is fixed to a wall surface (upper forming section) 4c above the slit section 3 protruding into the exterior case 2. . 9 is a nut for fixing the terminal.

In this case, as shown in FIG.
A U-shaped fitting portion 8a is provided in a lower portion, and a fitting dimension between the facing surfaces of the fitting portion 8a is set to be smaller than a width dimension orthogonal to a longitudinal direction of the upper forming portion 4c of the slit portion 3 protruding into the exterior case 2. It is made slightly smaller and fitted. Fitting part 8
A taper is provided near the entrance of the upper part 4c.
Is easy to enter.

As described above, the U-shaped fitting portion 8a at the lower portion of the terminal block 8 has its fitting size slightly smaller than the width of the upper forming portion 4c of the slit portion 3 protruding into the outer case 2. When the terminal block 8 is pushed from above into the upper forming part 4c as shown in FIG.
It is elastically deformed by pressing from c and is fitted while being opened right and left.

FIGS. 15 and 16 are explanatory views showing another example of the shape of the fitting portion according to the fifth embodiment of the present invention. As shown in FIGS. 15 and 16, a V-shaped fitting portion 10 is formed above the upper forming portion 4 c of the slit portion 3 protruding into the outer case, and a projecting portion 11 a is provided below the opposing terminal block 11. It has a configuration. The tip of the projection 11a is tapered to facilitate entry into the V-shaped fitting portion 10. In this case, when the terminal block 11 is pushed into the V-shaped fitting portion 10 from above as shown in FIGS. 15 to 16, the V-shaped fitting portion 10 is elastically deformed by the pressing from the projection 11 a and fitted while being opened right and left. Is what you do.

As described above, according to the present embodiment, the plurality of capacitor elements 1a to 1
1c and an external lead-out terminal portion 6, a terminal block 8 for fixing the external lead-out terminal portion 6 is provided, and the terminal block 8 is fixed to an upper forming portion 4c of the slit portion 3 protruding into the exterior case 2. Therefore, there is no need to install a new portion for fixing the external lead-out terminal portion 6, and it is possible to appropriately and reliably install the external lead-out terminal portion 6 on the upper part of the capacitor outer case 2. Therefore, there is an effect that the workability for installing the external lead-out terminal portion 8 is further improved, and the appearance quality is significantly improved. In addition, you may comprise with Embodiment 3 and 4.

A sixth embodiment of the present invention will be described with reference to FIGS. FIG. 17 shows a sixth embodiment of the present invention.
FIG. 18 is a side view of the capacitor assembly according to the sixth embodiment, and FIG. 18 is an enlarged view of a main part in the sixth embodiment.

As shown in FIG. 17, in a configuration in which a plurality of capacitor elements 1a to 1c housed in an outer case 2 and an external lead-out terminal portion 6 are provided as in the first and second embodiments, A capacitor assembly including a plurality of outer cases 2 for parallel connection,
The projection 1 is provided on the wall surface opposite to the wall surface on which the slit portion 3 is provided.
The outer case 2 is connected and fixed by fitting the projection 12 and the slit 3 of the other outer case 2. In this case, a capacitor connecting projection 12 is formed on the longitudinal side surface opposite to the longitudinal side surface on which the slit portion 3 is formed, and the width direction (direction orthogonal to the longitudinal direction) is formed.
Are fitted and fixed to the slit portions 3 of other capacitors having the same configuration.

The connecting projection 12 is plate-shaped as shown in FIG.
The fitting situation becomes better.

As described above, according to this embodiment, the projections 12 protruding from one capacitor outer case 2 and the other capacitor outer cases 2 Since the configuration is such that the capacitors are connected to each other by fitting the slit portions 3 of this type, this type of capacitor is generally used for connecting the capacitors in the width direction in the case of parallel connection generally performed. Since the connecting operation can be performed without forming a new part, the workability is improved. In addition, you may comprise with Embodiment 3-5.

A seventh embodiment of the present invention will be described with reference to FIGS. FIG. 19 shows the seventh embodiment of the present invention.
FIG. 20 is a plan view of a capacitor assembly according to the seventh embodiment, and FIG. 20 is an enlarged view of a main part in the seventh embodiment.

As shown in FIG. 19, in the structure similar to the first and second embodiments, a plurality of capacitor elements 1a to 1c housed in the outer case 2 and the external lead terminal 6 are provided. A capacitor assembly is formed in the same manner as in the sixth embodiment, and when connecting a plurality of capacitor outer cases 2 in parallel in the width direction, they are fitted to the slit portions 3 so that the installation intervals between the outer cases 2 are constant. A stopper 13a is provided on the projection 13 for positioning. In this case, a connecting projection 13 having a capacitor installation interval determining stopper 13a is formed on the longitudinal side surface opposite to the longitudinal side surface on which the slit portion 3 is formed, and is formed in the width direction (direction orthogonal to the longitudinal direction). This is fitted and fixed to the slit portion 3 of another capacitor having a similar configuration.

The connecting projection 13 has a convex cross section as shown in FIG. 20, and its stepped portion serves as a stopper 13a for determining the capacitor installation interval, and the leading end side of the stopper 13a is inserted into the slit 3. It becomes the part 13b.
If the fitting portion 13b is formed slightly thinner toward the distal end, the fitting state becomes better.

As described above, according to this embodiment, in order to prevent the capacitors from adhering to each other, the intervals between the capacitors are set by the slits 3 fitted to the projections 13 protruding from the capacitor outer case 2. Since the stopper 13a for determining the installation interval is provided on the projection 13 so as to keep the space constant, a space for preventing deterioration of characteristics due to heat generation between the capacitors, which is a problem when capacitors are installed and connected in parallel, is provided. It is possible to maintain an appropriate distance only by performing the distance determination installation work in parallel, and it is possible to eliminate human errors such as incorrect installation distances. In addition, you may comprise with Embodiment 3-5.

An eighth embodiment of the present invention will be described with reference to FIGS. FIG. 21 shows an eighth embodiment of the present invention.
FIG. 22 is an equivalent circuit diagram of the capacitor according to the embodiment.

FIG. 21 shows a configuration example using four capacitor elements 1a to 1d since the above description has been made using three capacitor elements 1a to 1c.

That is, the capacitor shown in FIG. 21 includes an outer case 2 for accommodating the capacitor elements 1a to 1d and an external lead-out terminal portion 6, and a plurality of capacitor elements 1a to 1d are arranged in the outer case 2 in the longitudinal direction. At this time, a slit portion 3 is formed between each capacitor element, and a plurality of slit portions 3 formed in the outer case 2 are formed on a wall surface in a longitudinal direction with respect to an opening of the outer case 2.

FIG. 21 also shows an example in which the lead wire 14 is actually connected to the external lead terminal 6 from the capacitor element. FIG. 22 is an equivalent circuit diagram thereof.

In the first to seventh embodiments, the connection lead wire 14 and the like have been omitted for the sake of simplicity. However, in order to function as a capacitor, the connection by the lead wire is necessary. Even when the lead wires are connected in the first to seventh embodiments, the respective effects can be obtained similarly.

FIGS. 23 and 24 are schematic views of the capacitor element used in the above embodiment. 23 has a vapor-deposited metal film 15 formed by vapor-depositing a metal on a plastic film 16, and two such metallized plastic films are wound together to form a capacitor element.

Further, as shown in FIG. 24 (a), a metal for electrode extraction is sprayed in a round element shape, or as shown in FIG. 24 (b), pressed into a required shape and then sprayed with the metal for electrode extraction. The capacitor element 1 is formed. Reference numeral 17 denotes a metal spray electrode portion for extracting an electrode. In addition, it goes without saying that the insulation configuration and shape of the capacitor element are not limited to those described in the present invention, but may be other than those described above and still have the effects described in the present invention.

According to the present invention in the above-described configuration and the like, the configuration is such that a better heat radiation state of the capacitor element is formed, and furthermore, it is structurally strong, inexpensive, excellent in workability, and easy to use such as installation. Capacitors can be provided, and the heat dissipation structure of the capacitor improves reliability, improves the workability when making the capacitor, and reduces the installation space for the capacitor. Become.

As a result, it is possible to provide a capacitor which is smaller in size, lighter in weight, has a reduced installation space, has good manufacturing workability, and has excellent life characteristics.

[0077]

According to the capacitor of the first aspect of the present invention, an opening is formed in one of the opposing walls of the outer wall case, and a slit portion is formed in the outer case so as to separate each capacitor element. Since it is provided, an air layer continuous with the outside can be provided between the plurality of capacitor elements, and the heat generated by the capacitor elements can be radiated to the outside directly through the slit portion. Further, since the opening is provided on one wall surface of the outer case, the case is continuously formed on the other wall surface. Therefore, the mechanical strength of the capacitor outer case does not decrease.

Further, since a connecting portion for communicating between the capacitor elements is provided in the outer case, and the insulating resin potted in a state where the hermeticity is maintained in the outer case is filled through the connecting portion. Electrical connection between the respective capacitor elements can be easily made, and the potted insulating resin is continuously filled in the outer case, so that only one potting operation is required and the forming operation is efficient. At the same time, the temperature distribution at the time of curing the potting resin is improved by the above configuration, and the curing is completed in a short time.

According to the present invention, the outer case has a plurality of element spaces arranged in parallel in the longitudinal direction, and the slits electrically insulate the plurality of capacitor elements housed in the element spaces. With this configuration, it is not necessary to provide insulation between the individual elements when capacitor elements having different electrodes are simultaneously stored in the same capacitor outer case, and the capacitor elements can be stored continuously in the longitudinal direction. The function and effect of claim 1 can be exerted at the same time as making the electrode capacitor compact.

According to the third aspect, the plurality of slits are formed on the wall surface in the longitudinal direction of the outer case, and the opening directions of the slits are different. Therefore, an air layer continuous with the outside can be provided between the plurality of capacitor elements, and heat generated by the capacitor elements can be radiated to the outside directly through the slit portion. In addition, since the slit portions are randomly arranged on the longitudinal wall surface, the heat radiation effect is substantially uniformly distributed on the longitudinally opposed wall surface without being concentrated on one case wall surface. It becomes possible. In particular, the effect is enormous when three or more elements are used.

According to the fourth aspect, the slit has an opening height that is at least half the height of the outer case and is opened based on the bottom surface of the outer case. Since the height of the capacitor element is always lower than that of the outer case, the opening is at least half the height of the capacitor element. That is, at the hottest point where the temperature of the capacitor element becomes the highest, the heat radiation effect is obtained. Is obtained.

According to the fifth aspect, since the width of the slit in the width direction is 0.4 mm to 10 mm, it is difficult to form the slit when the width of the slit in the width is 0.4 mm or less. Or a sufficient convection of air cannot be obtained, and a predetermined heat radiation effect cannot be obtained, and a heat radiation effect of 10 mm or more can be sufficiently obtained. It is possible to obtain the effect that the size becomes unnecessarily large and that the mechanical strength is not reduced by the connecting portion of the capacitor outer case.

According to the sixth aspect of the present invention, a terminal block for fixing the external lead-out terminal portion is provided, and this terminal block is fixed above the slit protruding into the outer case. Therefore, it is not necessary to install a proper part, and it is possible to appropriately and surely install it on the upper part of the capacitor outer case. Therefore, there is an effect that the workability for installing the external lead-out terminal portion and the assurance of appearance quality are remarkably improved.

According to a seventh aspect of the present invention, a plurality of exterior cases are provided for connecting the capacitors in parallel, and a projection is provided on a wall surface opposite to the wall surface on which the slit portion of the exterior case is provided. The outer case is connected and fixed by fitting it to the slit part of the case, so this type of capacitor forms a new part for connecting widthwise capacitors in the case of parallel connection generally performed Since the connecting operation can be performed without performing the operation, the working effect is improved.

According to the eighth aspect, the stopper is provided on the projection so as to be fitted and positioned in the slit so as to keep the installation interval between the outer cases constant, so that the capacitors are installed and connected in parallel. An appropriate distance can be maintained only by installing the space distance determining operation for preventing the characteristic deterioration due to heat generation between the capacitors, which is a problem in such a case, in parallel. For this reason, it has the effect of eliminating human error such as incorrect installation distance.

[Brief description of the drawings]

FIG. 1 is a perspective view of a capacitor according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional plan view of the capacitor according to the first embodiment.

FIG. 3 is a front view of the capacitor according to the first embodiment.

FIG. 4 is a side view of the first embodiment.

FIG. 5 is a cross-sectional plan view of a conventional capacitor to be compared with the present invention.

FIG. 6 is a front view of FIG. 5;

FIG. 7 is a sectional plan view of a capacitor according to a second embodiment of the present invention.

FIG. 8 is a front view of the capacitor according to the second embodiment.

FIG. 9 is a front view of a capacitor according to a third embodiment of the present invention.

FIG. 10 is a graph of a temperature rise ratio of a capacitor according to a height at which a slit portion is formed in a third embodiment.

FIG. 11 is a front view of a capacitor according to a fourth embodiment of the present invention.

FIG. 12 is a graph of a temperature rise ratio of the capacitor according to the width of the slit portion in the fourth embodiment.

FIG. 13 is a sectional front view of a capacitor according to a fifth embodiment of the present invention.

FIG. 14 is an enlarged view of a portion α in FIG. 13;

FIG. 15 is an explanatory view showing another example of the shape of the fitting portion according to the fifth embodiment of the present invention.

FIG. 16 is an operation explanatory view showing another example of the shape of the fitting portion in the fifth embodiment.

FIG. 17 is a side view of a capacitor assembly according to a sixth embodiment of the present invention.

FIG. 18 is an enlarged view of a main part in the sixth embodiment.

FIG. 19 is a plan view of a capacitor assembly according to a seventh embodiment of the present invention.

FIG. 20 is an enlarged view of a main part according to a seventh embodiment.

FIG. 21 is a sectional front view of a capacitor according to an eighth embodiment of the present invention.

FIG. 22 is an equivalent circuit diagram of the capacitor of FIG. 21.

FIG. 23 is a schematic view of a formation state of a capacitor element used in each embodiment.

FIG. 24 shows a capacitor element used in each embodiment.
(A) is a schematic diagram in the case of a round shape, (b) is a schematic diagram in the case of an oval shape.

FIG. 25 is a partially cutaway perspective view of a conventional capacitor.

FIG. 26 is a cross-sectional view of another conventional capacitor.

FIG. 27 is a sectional view of still another conventional example.

[Explanation of symbols]

1a, 1b, 1c, 1d Capacitor element 2 Outer case 2a Element space 2b Connecting part 3 Slit part 4a, 4b, 4c, 4d Wall surface of outer case forming slit part 5 Insulating resin part 6 External lead-out terminal part 7 Insulating film Reference Signs List 8: terminal block for fixing external lead-out terminal 9: nut for fixing external lead-out terminal 10: V-shaped fitting portion 11: projection to be fitted to V-shaped fitting portion 12: projection 13: projection 13a: stopper 14: lead wire 15: metal deposited film Part 16 Plastic film 17 Metal sprayed electrode part for extracting electrode 18 Capacitor element of Conventional Example 1 19 Bar-shaped body 20 Through hole 21 Semicircular vertical groove part 22 Synthetic resin 23 Capacitor element of Conventional example 2 24 Air duct 25 Synthetic resin 26 Conventional example 3 capacitor element 27 resistor 28 diode 29 outer case 30 lead-out terminal 31 Lit part 32 Barrier part

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01G 4/38 H01G 4/24 301K 301B 4/38 A (72) Inventor Akiko Okuno Okadoma, Kadoma City, Osaka Prefecture 1006 Matsushita Electric Industrial Co., Ltd. F term (reference) 5E082 AA11 AB04 BB03 BC25 BC31 CC06 CC17 FF05 FG06 FG36 GG01 GG22 HH02 HH08 HH12 HH28 HH47 KK07 LL13 PP08 PP09

Claims (8)

[Claims] An exterior case accommodating a plurality of capacitor elements, and an external lead-out terminal electrically connected to the capacitor elements, wherein one of the opposing wall surfaces of the outer wall case is provided Opening and providing a slit portion in the outer case so as to separate each capacitor element, and having a connecting portion communicating between the capacitor elements in the outer case, the hermeticity was maintained in the outer case. A capacitor, wherein an insulating resin potted in a state is filled through the connecting portion. 2. The exterior case has a plurality of element spaces arranged in parallel in the longitudinal direction, and the slits are configured to electrically insulate a plurality of capacitor elements housed in the element spaces. The capacitor according to claim 1. 3. A plurality of slit portions are formed on a longitudinal wall surface of the outer case, and the opening directions of the respective slit portions are different, and are opened on one or the other of the opposed longitudinal wall surfaces. 2. The capacitor according to 2. 4. The slit portion has a height of 1 / the height of the outer case.
4. The capacitor according to claim 2, wherein the capacitor has an opening height of 2 or more and is opened based on the bottom surface of the outer case. 5. An opening in the width direction of the slit portion having a width of 0.1 mm.
The capacitor according to claim 2, 3 or 4, which has a size of 4 mm to 10 mm. 6. The capacitor according to claim 2, wherein a terminal block for fixing the external lead-out terminal section is provided, and the terminal block is fixed on an upper portion of a slit protruding into the outer case. 7. A plurality of outer cases for connecting the capacitor according to claim 1, 2, 3, 4, 5, or 6 in parallel, and a wall surface opposite to a wall surface provided with a slit portion of the outer case. A capacitor assembly in which the outer case is connected and fixed by fitting the protrusion to a slit of another outer case. 8. The capacitor assembly according to claim 7, wherein a stopper portion fitted and positioned in the slit portion is provided on the protruding portion so that an installation interval between the outer cases is constant.